Amend project load time for each ProjectProvider instance

Close #596.
Fix typo in error message
Merge pull request #752 from mleech/error-message-typo

Fix typo in error message
Merge pull request #751 from dungpa/loadtime

Amend project load time for each ProjectProvider instance
add Paket exe config files into .gitignore
ProjectProvider.FullOutputFilePath returns Option<string> since it cannot be available during VS closing
Merge pull request #754 from vasily-kirichenko/fix-NRE-on-VS-exit

ProjectProvider.FullOutputFilePath returns Option<string> since it canno...
Improve error handling

- Remove error message box (it's too annoying).
- Always fix project load times (to not use fake load times anymore).
- Log exceptions.
Merge pull request #755 from dungpa/loadtime

Improve error handling
fixed: printf formatters aren't colorized in try..with..finally expressions
fixed: printf formatters aren't colorized in record/DU members and extension members
Merge pull request #759 from vasily-kirichenko/fix-printf-colorizing

fixed: printf formatters aren't colorized in try..with..finally expressions
Merge branch 'master' of https://github.com/fsprojects/VisualFSharpPowerTools into tasklistv2
synced branch with upstream/master to fix build