Git requirements

[ChristianLieven]

• [x] fix #524, #523

• [x] description of feature/fix

• [x] add an entry to the next release

• Include memote's requirement for git on installation instructions (README and docs).

• Check for the presence of git in CLI commands that require it.

[codecov[bot]]

Codecov Report

Merging #645 into develop will decrease coverage by 0.07%. The diff coverage is 76.92%.

@@            Coverage Diff            @@
##           develop   #645      +/-   ##
=========================================
- Coverage    85.07%    85%   -0.08%     
=========================================
  Files           59     59              
  Lines         3243   3261      +18     
  Branches       436    436              
=========================================
+ Hits          2759   2772      +13     
- Misses         397    401       +4     
- Partials        87     88       +1

Impacted Files	Coverage Δ
memote/suite/cli/reports.py	75.55% <100%> (+0.55%)	:arrow_up:
memote/suite/cli/runner.py	52.2% <100%> (+0.5%)	:arrow_up:
memote/suite/cli/callbacks.py	78.84% <62.5%> (-2.98%)	:arrow_down:
memote/support/basic.py	92.04% <0%> (-1.06%)	:arrow_down:
memote/suite/reporting/history.py	98.03% <0%> (+0.03%)	:arrow_up:

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