Terminal: load themes from data and settings folders.

* Uses the same format as the Terminal settings file
* Adds an additional key, "Theme name", to settings for themes,
which needs to be present for a theme to be loaded, else it
will be skipped
* Loads themes from Terminal/Themes in the data and settings
directories, searching data first, then settings second,
allowing a theme to be tweaked by putting a copy in a
settings folder

Change-Id: I8cadf98151459c1ae6098c38481b16eb3f2cf952

Terminal: add support for per-theme custom ANSI colours.

* Updates the colour palette for Solarized
* Adds new colour palette, Relaxed (MIT License) [1]

[1]: https://github.com/Relaxed-Theme/relaxed-terminal-themes

Change-Id: Ia81120cd983b9c3b935f8a990867ee4b7c35b6d2
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4196
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: John Scipione <jscipione@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

CodeStyle fixes, some refactoring and cleanup

* Clear some codestyle issues catched by checker script;
* Rename RestartDebugCapture to more consistent StartStopDebugCapture;
* Updated Copyrights and authors lists, some occurences of the raw MIT
licence text replaced with "under the terms of MIT licence" reference;
* Fixes for x86_64 build.

This is cumulative cleanup commit for series of Terminal refactoring
changes I have introduced last time. No significant functional changes.

OSC and color management improoved

* Global kTermColorTable replaced with it's private copy for every
TermView instance. This allows to modify colors table for every view
separately;
* Set of ANSI normal/bright color entries added into preferences;
* Default color table generated dynamicaly using ANSI colors
preferences. 6x6x6 color cubes and grayscale ramp are generated in
xterm colors model;
* Improoved support of Operating System Command control sequences;
* Support for X11 rgb.txt compatible color names. Corresponding entries
are stored in hashed form in application resource and loaded only on
demand.

Change schema in Terminal to color scheme.

Love this feature, but, color schema is not a thing, it is a color
scheme. Change both the display text and the variable names.

Also changed "Retro Terminal" color scheme to just "Retro". Terminal
is redundant.

Terminal: Spice up terminal color scheme selection

Better wording.
The colors don't need to be public.
Style.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37759 a95241bf-73f2-0310-859d-f6bbb57e9c96

Style.
Add NULL guard to the color schemes struct, although the code was safe
neverthless (for now)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37575 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add a menufield to select color combinations, and add obvious
"white on black" and "black on white". For some reason these aren't
applied live, like when you chose a custom combo.
I'm not really fond of the code, and will rework it in the next few days.
But at least it works!


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37535 a95241bf-73f2-0310-859d-f6bbb57e9c96

CodeStyle fixes, some refactoring and cleanup

* Clear some codestyle issues catched by checker script;
* Rename RestartDebugCapture to more consistent StartStopDebugCapture;
* Updated Copyrights and authors lists, some occurences of the raw MIT
licence text replaced with "under the terms of MIT licence" reference;
* Fixes for x86_64 build.

This is cumulative cleanup commit for series of Terminal refactoring
changes I have introduced last time. No significant functional changes.

OSC and color management improoved

* Global kTermColorTable replaced with it's private copy for every
TermView instance. This allows to modify colors table for every view
separately;
* Set of ANSI normal/bright color entries added into preferences;
* Default color table generated dynamicaly using ANSI colors
preferences. 6x6x6 color cubes and grayscale ramp are generated in
xterm colors model;
* Improoved support of Operating System Command control sequences;
* Support for X11 rgb.txt compatible color names. Corresponding entries
are stored in hashed form in application resource and loaded only on
demand.

Change schema in Terminal to color scheme.

Love this feature, but, color schema is not a thing, it is a color
scheme. Change both the display text and the variable names.

Also changed "Retro Terminal" color scheme to just "Retro". Terminal
is redundant.

Terminal: Spice up terminal color scheme selection

Better wording.
The colors don't need to be public.
Style.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37759 a95241bf-73f2-0310-859d-f6bbb57e9c96

Style.
Add NULL guard to the color schemes struct, although the code was safe
neverthless (for now)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37575 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add a menufield to select color combinations, and add obvious
"white on black" and "black on white". For some reason these aren't
applied live, like when you chose a custom combo.
I'm not really fond of the code, and will rework it in the next few days.
But at least it works!


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37535 a95241bf-73f2-0310-859d-f6bbb57e9c96