Initial Merge to Prepare Release 1.0.0

See merge request sharing/codeability-sharing-platform!17

Resolve "Search results do not make sense"

See merge request sharing/codeability-sharing-platform!16

Previously, hitCount was increased every time
a new batch of results was loaded.

Statistics

See merge request sharing/codeability-sharing-platform!11

added GitlabService.java to offer basic gitlab api functionalities like check if repo exists etc. , added check in StatisticsResource to avoid people sending get requests with IDs which not exist and therefore create lots of trash entities

Resolve "Sharing Plugin Infrastruktur optimieren"

See merge request sharing/codeability-sharing-platform!9

Resolve "Fix secrets in source code!"

See merge request sharing/codeability-sharing-platform!7

into 8-umsetzung-der-graphischen-oberflache-von-gernot

This reverts commit 15b448d9.