Shared: JSON Parse Perf

Improve the mechanics for JSON parsing by reusing
text buffers during the parse.

Change-Id: I7fb2cae31e6558a5a0c63fd02e1fc6fec4f9e4b3
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7106
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

HaikuDepot : additional debugging for json-rpc invocations

Implementation of JSON Streaming Parser

Addition of missing files from previous commit

BJson: Use the normal "input, output" argument ordering instead of the reverse.

Update all in-tree consumers of the BJson API to match. Also added
const-qualifiers to the BString versions of the API, and added the leading
"_" to the header guards.

JSON parser: Improve by using exceptions to get exact error

Also strip redundant "_Parser_" prefix from private methods.

Json: Don't force someone including to use BPrivate.

libshared: Introduce JSON parser and MessageBuilder.

Based on an earlier piece of source code of mine that parsed JSON into
QObjects, this JSON parser creates a BMessage tree.

Will be used by Stephan in HaikuDepot for communication with the web app.

JSON parser: Improve by using exceptions to get exact error

Also strip redundant "_Parser_" prefix from private methods.

Json: Don't force someone including to use BPrivate.

libshared: Introduce JSON parser and MessageBuilder.

Based on an earlier piece of source code of mine that parsed JSON into
QObjects, this JSON parser creates a BMessage tree.

Will be used by Stephan in HaikuDepot for communication with the web app.