[CenterOfMass] Searchbar, BOM import, Zero mass, Fixes

[s-quirin]

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Changelog:

• New: Searchbar for solids
• New: Reworked import function to improve external bill of materials (BOM) import with better input tolerance
• Fix: Changed caption "weight" to "mass" in export file
• Code: Indentation of on_pushButton_Export() similar to on_pushButton_Import()
• Code: Idiomatic python
• New: Mass can be set zero to exclude solid from calculation and visualization
• Fix: Behaviour of default value spin and "Apply to all"
• Fix: Preserve original solids color when "New" button pressed

[galou]

@chupins Are the changes OK for you?

[chupins]

Completly ok for me. Thanks @s-quirin for your answer and polishing !

[luzpaz]

bump