Fix licenses

CAmkES errors store msg lines in exception args

This is to simplify unpacking of multi-line error messages, and
iterating over each line. Previously this was just done for
TemplateErrors. Now it's done for all CAmkESErrors, from which all other
CAmkES error types inherit.

Corrected underlining of template errors

The camkes runner likes to prepend a context string to the start of
error messages. Template error messages are two lines long, with the
second line containing an underline which must be appropriately aligned
to the first line. Prepending a string to the error message breaks this
alignment. The solution is for template errors to be a list of lines,
rather than a multiline string, and prepending the context to each line
in the runner.

JIRA: CAMKES-551

Pass column and source information to CAmkESError.

Not used as yet.

Consolidate error formating logic in CAmkESError.

Make all CAmkES errors inherit from CAmkESError.

No additional functionality or consolidation as yet.

Refactored parser init commit.