Allow to change app. name using CMake cache (#34, #71)

[ghost]

• [x] Allow to change AppName in config.h
• [x] Replace most hardcoded strings in other files
• [x] Replace Qt application name
• [ ] Replace name in translations
• [x] Rebase on dev to allow automatic merge

[crackedmind]

:white_check_mark: Build kepka 1.0.56-xivhvble completed (commit https://github.com/procxx/kepka/commit/10f1df9b19 by @foxcpp)

[ghost]

• [ ] Replace name in translations

Requires more work than I expected. I think it's ok to merge without this.

[crackedmind]

:white_check_mark: Build kepka 1.0.60-jcqktpec completed (commit https://github.com/procxx/kepka/commit/2078b912ad by @foxcpp)

[ghost]

Ping?

[leha-bot]

Looks good for me.

[leha-bot]

Thank you all