McCode: Devise radical dependence reduction contingency

[climbcat]

Currently, a lot of special build, package, install, and related distribution steps have been taken to enable tools and features on various platforms.

Contingencies might involve:

• radical dependence reduction within applications, replacing these with alternatives or new developments (e.g. replace qscintilla with textbox, pqtgraph with matplotlib, etc.)
• feature reduction to essentials
• developing and packaging a core of highly portable tools that cover essentials
• bundling everything in a sandbox
• increasingly relying on browser/web technologies
• including and distributing python packages as (fixed-version) source code packages alongside py-tools

As I am informed, the user base works mainly on debian, centos/redhat, mcosx, and windows. Every platform should have a mcrun, a mcgui, a mcplot and a mcdisplay at least. There are quite a few features in mcstas that may not target every platform, but perhaps a list of these essentials vs. addons might be useful in getting to some viable contingencies, or deciding clearly that such aren't realistic at this point.

[willend]

https://github.com/McStasMcXtrace/McCode/issues/572 is a way to "bundle everything in a sandbox" and is platform independent... Kind of...

[farhi]

The new conda approach together with deb/rpm should fulfill a solid baseground for distributing the software across many systems.

[farhi]

Related to #1300 #1293