Answer --help and --version in every program

[Maik-0000FF]

Closes #48.

The editor built no parser and handed a second start over before looking at any argument, so bindpeek-editor --version raised the running window instead of answering. The keyboard service read no arguments at all.

• New src/CommandLine.{h,cpp}: application name and version, the parser, and the check for an invocation that needs no display. Compiled into both Qt programs.
• The program name now comes from the build per target, like the version already did. No source file spells it out.
• The keyboard service answers both options before it opens a descriptor, and its messages read the same two values.
• New test measuring the check against the parser it runs ahead of.