Allow to specify more than one context for csolution and cbuild

[ReinhardKeil]

For multi-project applications it might be required to build a mixture of build-types. I suggest therefore to allow to specify multiple --context options with the various tools of the CMSIS-Toolbox.

For example:

cbuild my.csolution.yml --context .debug --context hellocm0.release

This would build all cproject.yml files with build-type debug except the hellocm0.cproject.yml that would use build-type release.

By default, I would suggest that that cbuild and csolution uses the first build-type in the list and generates the different files. To build all different combinations, the option -c * would be required. But details of this option should be discussed.

See also #821

[ReinhardKeil]

I suggest that we only add the functionality to cbuild. For csolution it is OK to support just one context at a time.

[ReinhardKeil]

This needs review in after deciding on context-set

[ReinhardKeil]

See also #896

[jkrech]

see CMSIS-Toolbox 2.0.0-dev2

[jkrech]

Still waiting for the additional option to replace a context.

[ReinhardKeil]

@jkrech not sure what you miss. I suggest we close this for now as it seems OK to me.

[jkrech]

see: #1033

Missing was --context-replacement

--context .Debug --context myproj1.Release

works additive and is not replacing: myproj1.Debug and myproj1.Release are built

--context .Debug --context-replacement myproj1.Release

will replace myproj1.Debug with myproj1.Release

[jkrech]

!!! --context-replacement is not implemented in CMSIS-Toolbox 2.0.0
this part of the feature is now captured in #1040