[danoli3]

Fixes #303.

The JSON pbxproj writer appended only the first word of a value to array build settings (cols[3] of the space-split command), so HEADER_SEARCH_PATHS got src/sub for src/sub folder and ../addons/ofxSpace for ../addons/ofxSpace Addon/src. Now the whole value is kept, and a value with spaces is stored quoted ("src/sub folder") the way Xcode itself writes such paths, since Xcode splits build settings on whitespace. Addon flags are already split into single words before this, so they're unchanged.

Before / after, project my proj with src/test 2.h, src/sub folder/deep.h, addon ../addons/ofxSpace Addon with src/inner dir/sp.h:

master: ['$(OF_CORE_HEADERS)', 'src', 'src', 'src/sub', '../addons/ofxSpace', '../addons/ofxSpace']
this:   ['$(OF_CORE_HEADERS)', 'src', 'src', '"src/sub folder"', '"../addons/ofxSpace Addon/src"', '"../addons/ofxSpace Addon/src/inner dir"']

#include "..." already worked through Xcode's header map; #include <deep.h> / <sp.h> (search paths only) failed on master with 'deep.h' file not found with <angled> include and builds with this (xcodebuild Release arm64). xcodebuild -showBuildSettings expands them as single quoted paths.

[danoli3]

Combined into #683.