added CommonRandomNumbers.h to code generation

[zeniheisser]

Minor fix to the plugin, so that all necessary headers are exported at code generation

only missing part to be able to run straight out of the madgraph interface now is googletests

[roiser]

Shall we remove the header in the "old" place in our github repo (/tools)?

[zeniheisser]

@roiser that would probably make sense, no reason to keep double copies of it

[valassi]

Hi @zeniheisser thanks for the patch!

There were (to my taste) a few missing issues, I have now included them in a followup MR #662, in particular

• I regenerated all processes SA and MAD in the repo with the patch in epochX/cudacpp
• I removed the dependency on the tools directory from cudacpp.mk (this is one of the main points of removing CommonRandomNumbers.h: the dependency is no longer needed, then it is better to remove it for clarity, also so that there is no confusion where the headers are taken from)
• As CommonRandomNumbers.h is now in the plugin, my script checked formatting, and so I reformatted it using clang-format (in addition, I also added the license and copyright)

[valassi]

PS This is related to #613 (generated code should be relocatable)