Gui work

-Increased default width a bit
-Made the compile output window resizable
-Italicized the text in individual file progress views to differentiate
better from main files, also changed color of the progress bar for them
-Fixed a concurrency error
-Button to expand and retract the compile output window now toggles
between > and < text
-Build status items now have tooltips for items that could get longer
than the allocated space
-Text for subchildren of chunks and precompiled headers now span the
whole row rather than displaying in the "progress" column
Merge branch 'master' of https://github.com/ShadauxCat/csbuild