[x265] [PATCH RFC] presets: adjust presets to increase spread and align closer with x264 presets

[Deepthi Nandakumar]

Since the default preset is medium, shouldnt x265_param_default apply
medium settings only? So that the if (!strcmp(preset, "medium")) block here
is empty??
In that case, the preset (if specified) will change only the ones which are
different from medium?

Also, there are a few params here that
1. arent used and arent initialised properly (eg, constrainedIntra,
weightedBipred)  lets remove them and add them back when the feature
exists.
2. that are dependent on other param fields, like EnableRdo, EnabledRDOQ
depends on RDLevel. This particular case is handled safely inside
encoder::configure, but not sure about all such cases.

Just thought this is a good time for springcleaning.
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