mbed CLI 0.7.x fixes and additions

[screamerbg]

Fixes:

• Fixed message regarding program root No mbed default command. #209
• Help find correct tools path by searching for make.py. Related to mbed update --clean did not delete .pyc files causing error #215
• Fixed importing inside git tree (non-program) Can't mbed import inside of git tree #211
• Download mbed 2.0 SDK tools only if mbed.bld is present Why does mbed cli download a version of mbed tools in to a .temp folder if it does not find tools in the current directory? #216
• mbed export options now match project.py (just added help for the --options) export command - help does not contain all options #200
• mbed help command is an alias to mbed --help mbed help should show the help instead of fail #191

Documentation:

• Documentation for mbed deploy mbed 'deploy' not documented #203
• Asymmetric git workflow documentation Feature: Change repository origin #126
• Set program default target/toolchain during 'mbed compile' if no defaults are set mbed compile -t GCC_ARM -m K64F --tests should set the default toolchain and target #207

@bogdanm @sg-

[jupe]

please create properly release this time

[jupe]

this whole file should refactor more modular parts so that its easier to follow and further develop, now there is 2000 lines of big code chunk..

[jupe]

by the way, when you start create test cases against all these changes? how you can ensure now that existing features are not going to be broken after you merge something without proper tests?

[screamerbg]

@jupe There is 0.7.3 release already. Regarding testing - mbed CLI could definitely benefit more tests. Hope you're happy to contribute to tests. Looking forward to it.

[SeppoTakalo]

This is not fixing the #215, it is just making the problem disappear. But files still exist.

[sg-]

LGTM 👍