Extra options for exporting the 3d model of the board

[leoheck]

Ignore not mounted components. is an interesting option when exporting .step model of the board from the GUI.

But I think it is missing from the CLI, isn’t it?

Also, an option to exclude step models that are not touching or maybe over the PCB would be helpful too. (on both GUI and CLI of course)

I am currently using this version.

Application: KiCad PCB Editor x86_64 on x86_64

Version: 7.0.9-7.0.9~ubuntu23.10.1, release build

Libraries:
	wxWidgets 3.2.2
	FreeType 2.13.1
	HarfBuzz 8.0.1
	FontConfig 2.14.2
	libcurl/8.2.1 OpenSSL/3.0.10 zlib/1.2.13 brotli/1.0.9 zstd/1.5.5 libidn2/2.3.4 libpsl/0.21.2 (+libidn2/2.3.3) libssh/0.10.5/openssl/zlib nghttp2/1.55.1 librtmp/2.3 OpenLDAP/2.6.6

Platform: Ubuntu 23.10, 64 bit, Little endian, wxGTK, ubuntu, x11

Build Info:
	Date: Nov  8 2023 19:00:56
	wxWidgets: 3.2.2 (wchar_t,wx containers) GTK+ 3.24
	Boost: 1.74.0
	OCC: 7.6.3
	Curl: 8.2.1
	ngspice: 40
	Compiler: GCC 13.2.0 with C++ ABI 1018

Build settings:
	KICAD_SPICE=ON