Change lower limit of video bitrate from 100kbps to 64kbps

If we use high quality audio streaming by mp3 320kbps at NicoNicoLive
streaming service in Japan,
since the total bit rate has been limited to 384kbps, We hope to change
lower limit of video bitrate from 100kbps to 64kbps.
Remove OBS directory from CrowdIn script again, since OBS Studio localization will be in a different CrowdIn project.
Merge pull request #345 from dodgepong/latest-crowdin-translations

Revert change to CrowdIn script
Update recording logic to better reflect ConfigFile settings

ConfigFile doesn't distinguish between non-existent keys and keys with
an empty (string) value; therefore we default to treating an empty
SavePath as default save path (and warn the user when setting an empty
SavePath)

Recording is now always enabled (unless previewing)
Remove shaderCache directory creation

This should have been in 9a9deb5d4cd0c639f4eddaa4af449c10189887bc
Merge pull request #344 from shousa/master

Change lower limit of video bitrate from 100kbps to 64kbps
Increase timeout on waiting for hotkey thread to exit
Log x264 bitrate and buffer size changes

Previously buffer size changes were not logged by the settings dialog
Show IDC_INFO only when necessary

Checking the video encoder should be sufficient, as long as noone adds
a audio encoding only mode
Fix NullVideoEncoder triggering IDC_INFO when changing bitrate/buffer
Abort stream if x264 opencl fails