Features and fixes: SAMM, IEC61360, AsciiDoc, Fixes, no empty lists, package format

[MichaelHoffmeisterFesto]

DO NOT MERGE NOW

Features:

• SAMM - Models: import & export, edit hierarchical concept descriptions, create Submodel instances guided by these concepts
• Next gen IEC61360 concept descriptions: hierarchical concept descriptions by "organizes" attribute, create Submodel instances guided by these concepts
• AsciiDoc: editing and generation of SMT specifications in AsciiDoc based on specially crafted Submodels alongside with SMT models
• plugin Asset Interface Description (preliminary version; 1.0 will realized by other branach)
• plugin Product Change Notifications

Fixes:

• various fixes in GH repo
  • issue #152
  • fix issue #193
  • improvement for issue #170
  • fix issue #33
  • fix issue #30
  • fix issue #23
  • fix issue #10 (duplicate)
  • fix issue #112
  • fix issue #112
  • fix issue #196
  • quick fix for issue #174
• New package format