Initial implementation of printf highlighting

Only those print functions that have the formatting string in the first position are enabled. Missing are: bprintf, fprintf, fprintfn, kbprintf, kfprintf, kprintf, ksprintf
Merge branch 'master' into printf

Conflicts:
	src/FSharpVSPowerTools.Core/SourceCodeClassifier.fs
	src/FSharpVSPowerTools.Logic/SyntaxConstructClassifier.fs
	src/FSharpVSPowerTools/SyntaxConstructClassifierProvider.cs
	tests/FSharpVSPowerTools.Core.Tests/SourceCodeClassifierTests.fs
Merge branch 'master' into printf

Conflicts:
	src/FSharpVSPowerTools/SyntaxConstructClassifierProvider.cs
Implement Task List comments
minor bug fix and added images
fixed warnings
removed unused code and small refactoring
fix environment-dependent red tests
fix line separators
Merge pull request #1 from bleis-tift/master

fix environment-dependent red tests
Merge branch 'master' of https://github.com/fsprojects/VisualFSharpPowerTools into tasklistv2
Merge branch 'master' of https://github.com/fsprojects/VisualFSharpPowerTools into tasklistv2
used FCS tokenizer to find comments
handled files in projects being added/renamed/removed
fixed problems with cached content
Merge branch 'master' of https://github.com/fsprojects/VisualFSharpPowerTools into tasklistv2
made tests more expressive
fixed problems from handling non-F# things
partially working: comments from files with build action = Compile
Merge branch 'tasklistv2' of https://github.com/bogdangaliceanu/VisualFSharpPowerTools into tasklistv2