cleaning only

moved platform_constants.h from openair2 to common directory
removed unused or dead code like MAC_XFACE or NB_THREAD_INST or unused functions

removed several files xxx_vars.h to make regular C code style: declare extern globals in a .h file, include this .h in all files that reference these globals and ALSO in the .c file that implement these globals
this work is still partial, but there was already a lot of modified files, so i will make more MRs

transformed variable constants into static const when it is constant

changed milestone to %REVIEW_CAN_START

added 4G-LTE 5G-NR labels

requested review from @schmidtr

OAI RAN-Container-Parent build (3627): failed (https://jenkins-oai.eurecom.fr/job/RAN-Container-Parent/3627/)

The title is "cleaning only" but the changes are quite big, so could you please summarize (even via a call) what you actually changed?

resolved all threads

changed the description

added 54 commits

• 2670f70f...1a0c0cd1 - 52 commits from branch develop
• 2aa5840b - cleaning only
• 88f83551 - code review comments

Compare with previous version

OAI RAN-Container-Parent build (3662): failed (https://jenkins-oai.eurecom.fr/job/RAN-Container-Parent/3662/)

added 55 commits

• 88f83551...214aa505 - 53 commits from branch develop
• 5b030b34 - cleaning only
• 06c642f8 - code review comments

Compare with previous version

OAI RAN-Container-Parent build (3746): failed (https://jenkins-oai.eurecom.fr/job/RAN-Container-Parent/3746/)

changed milestone to %REVIEW_IN_PROGRESS