[packaging] move to git based packaging
Add configuration value methods and signals

New methods: MCE_CONFIG_GET and MCE_CONFIG_SET
New signals: MCE_CONFIG_CHANGE_SIG

[mce-headers] Configuration value methods and signals added
Merge pull request #3 from spiiroin/config_api

Add configuration value methods and signals
Add script to check various files that hold package version

Helps to remember all the places that need to be modified
before releasing a new version.
Bump mce-dev version to 1.12.4