Feature/new gui design AEA-674

[panasevychol]

Proposed changes

New design of GUI applied #1395

Types of changes

What types of changes does your code introduce to agents-aea?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply.

• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have checked that code coverage does not decrease.
• I have checked that the documentation about the aea cli tool works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

[codecov-commenter]

Codecov Report

Merging #1487 into develop will increase coverage by 1.90%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1487      +/-   ##
===========================================
+ Coverage    88.41%   90.32%   +1.90%     
===========================================
  Files          242      243       +1     
  Lines        17184    17209      +25     
===========================================
+ Hits         15194    15544     +350     
+ Misses        1990     1665     -325     

Flag	Coverage Δ
#unittests	90.32% <ø> (+1.90%)	⬆️

Impacted Files	Coverage Δ
aea/cli_gui/__init__.py	100.00% <ø> (ø)
aea/helpers/dialogue/base.py	85.03% <0.00%> (-6.40%)	⬇️
aea/protocols/generator/base.py	82.33% <0.00%> (-0.39%)	⬇️
aea/test_tools/test_cases.py	84.87% <0.00%> (-0.36%)	⬇️
packages/fetchai/connections/soef/connection.py	100.00% <0.00%> (ø)
...kages/fetchai/connections/oef/object_translator.py	100.00% <0.00%> (ø)
aea/mail/base.py	100.00% <0.00%> (+1.78%)	⬆️
packages/fetchai/connections/oef/connection.py	65.25% <0.00%> (+2.46%)	⬆️
packages/fetchai/protocols/ledger_api/dialogues.py	85.18% <0.00%> (+3.70%)	⬆️
...etchai/connections/p2p_libp2p_client/connection.py	93.70% <0.00%> (+10.01%)	⬆️
... and 9 more

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[DavidMinarsch]

LGTM