Add missing std_logic_misc pkg to IEEE lib

[c-thaler]

This adds the std_logic_mis package to the IEEE libraries. AFAI this is a non-standard package available only in the Synopsys implementation.

[Paebbels]

Please incorporate these changes - I tried to propose them as direct changes in GitHub, but it doesn't allow suggestions outside of your edited regions ...

Please split the list into normal (VHDL-2008) packages and additional Synopsys packages:

PACKAGES = (
	(Math_Real, Math_Real_Body),
	(Math_Complex, Math_Complex_Body),
	(Std_logic_1164, Std_logic_1164_Body),
	(std_logic_textio, None),
	(Numeric_Bit, Numeric_Bit_Body),
	(Numeric_Bit_Unsigned, Numeric_Bit_Unsigned_Body),
	(Numeric_Std, Numeric_Std_Body),
	(Numeric_Std_Unsigned, Numeric_Std_Unsigned_Body),
	(Fixed_Float_Types, None),
	(Fixed_Generic_Pkg, Fixed_Generic_Pkg_Body),
	(Fixed_Pkg, None),
	(Float_Generic_Pkg, Float_Generic_Pkg_Body),
	(Float_Pkg, None),
)
SYNOPSYS = (
	(Std_logic_misc, Std_logic_misc_Body),
)

At next it would be best to add a method before AddLibrary like LoadSynopsysPackages. This method would add more packages listed in SYNOPSYS to the ieee library. See these related methods: https://github.com/VHDL/pyVHDLModel/blob/main/pyVHDLModel/__init__.py?ts=2#L447-L471

Is could then be used like this:

design = Design()

# ...

design.LoadStdLibrary()
ieee = design.LoadIEEELibrary()
ieee.LoadSynopsysPackages()

[c-thaler]

I added a LoadSynopsysPackages() to the Ieee library class.

[Paebbels]

Thanks for your contribution. I redirected the merge to dev and followed the release process by merging dev to main in #69 and finally tagging it as v0.24.1. Release should be published to PyPI in 3-4 minutes.