Merge GPSR changes

We set up the new grammar 'gpsr23.jsgf' which encompasses all -and only- possible command generator statements. Along with it comes the unfinished 'gpsr23generic.jsgf' grammar, which restricts commands to their required references. It might be worth to fully implement that one, but for the Robocup the former has been set as the active grammar.

requested review from @Lgraesner

assigned to @Lgraesner

added 5 commits

• 1c222ab4 - 1 commit from branch master
• f0c51db5 - Set up two new grammar types for gpsr
• 52dd95df - Fixed syntax errors in gpsr23alternate grammar and changed names to match command generator
• bdc6584b - fixed missing locations 'entrance' and 'exit'
• f2ce4148 - renamed new grammars, set default to 'gpsr23'

Compare with previous version

merged