Minor fixes to concept generators

[franzTobiasDLR]

Closes #879
Closes #1130

Updates the concept generator:

• Add server depenencies to new concept proejcts
• Update package location of SEIValidator
• Add java 11 automatic module header (we had a warning before)
• Changed way how the main-project name is derived from test & ui projects... before all 'ui' and 'test' strings were simply replaced... This was quite problemativ because it caused errors when the concept hat something with 'test' / 'ui' in its name
• Do a workspace refresh after generation is compelted to make sure icons are shown in the project explorer (also there we had a warning before that icons could not be found although they were generated)

No new concept project do not have warnings anymore. :)

[codecov]

Codecov Report

Merging #1152 (e9f1dac) into development (8d4f3f1) will decrease coverage by 0.05%.
The diff coverage is 75.00%.

❗ Current head e9f1dac differs from pull request most recent head 407216b. Consider uploading reports for the commit 407216b to get more accurate results

@@                Coverage Diff                @@
##             development    #1152      +/-   ##
=================================================
- Coverage          86.87%   86.83%   -0.05%     
+ Complexity          5146     5144       -2     
=================================================
  Files                629      629              
  Lines              25632    25657      +25     
  Branches            2330     2331       +1     
=================================================
+ Hits               22267    22278      +11     
- Misses              2580     2594      +14     
  Partials             785      785              

Files Changed	Coverage Δ
...el/concept/generator/ConceptLanguageGenerator.java	0.00% <0.00%> (ø)
...concept/generator/validator/GenerateValidator.java	94.44% <100.00%> (ø)
...econtent/ConceptFragmentTestManifestGenerator.java	100.00% <100.00%> (ø)
...ct/filecontent/ConceptPluginManifestGenerator.java	100.00% <100.00%> (ø)
.../filecontent/ConceptPluginUiManifestGenerator.java	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes