Refactor tools/compile_colibri

• uniform approach to path to make sure they are absolute (previously colibridir could have been relative)
• rearrange code into distinct sections (try to group side-effects together)
• introduce parse_options function
• make eclipselib point to lib/ARCH and eclipseexe point to executable file (instead of eclipseexe being lib/ARCH)

requested review from @bobot

assigned to @cjunke

mentioned in commit e8a64bb6

merged