Initial removal of all Imath source files and minimal cmake adjustments #791
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This PR will do the 'bare minimum' of removing Imath.
No source is moved from the IlmBase directory. Merely all Imath is removed. Even Iex is kept in.
Installation works on linux provided you have installed Imath beforehand. Currently it looks for Imath with the same version number as OpenEXR, currently set and working with imath_2_5. This can be changed in the future if necessary.
Further changes are going to be made but having this baseline may prove to be useful.