fixed: printf formatters are not colorized if printf function is namespace/module qualified
printf formatters are not colorized in plane strings
highlight fprintf formatters
fixed: float and wildcard printf formatters are not colorized
refactor SourceCodeClassifier
remove unused function
colorize more Printf functions

address the review
Merge pull request #844 from vasily-kirichenko/fix-printf-colorizing

Fix printf colorizing
add colorization profiling

change the way unused declarations are found
revert find unused declarations algorithm

SyntaxConstructClassifier returns file-based colorization first, then project-based
extract finding unused declaration logic out from GetAllUsesOfAllSymbolsInFile to GetUnusedDeclarations
SyntaxConstructClassifier keep Unused spans alive until new ones are ready in order to prevent blinking unused symbols/opens
fix a test
Small changes for clarity
remove commented code
Merge pull request #849 from dungpa/syntax-coloring

Minor correction on syntax coloring
Merge remote-tracking branch 'fsprojects/master' into profiling-colorization

Conflicts:
	src/FSharpVSPowerTools.Logic/SyntaxConstructClassifier.fs
refactor Profiler class
switching unused symbols highlighting to ProjectChecked event handler (WIP)
wip