improve log level configuration; remove old debug logs writing direct…

…ly to stdout

fix cache lookups for synthetic sources with known alternate paths

fix crash when parsing recursive options

note: the language server will not be able to resolve some recursive
option definitions, but it won't crash; this should only affect
test-like code exercising language edge cases.

set version to 0.7.1

support latest protobuf go generated code

formatter: split lines significantly longer than others into separate…

… groups

Update logos

vscode: add prompt to install if binary is missing

Fix synthetic sources missing custom options

Merge pull request #23 from kralicky/ci

Add simple test & binary release CI