Update `symoroui/labels.py` with new keys

Update `symoroui/labels.py` with new keys and include a new attribute to
store the widget keys in `symoroui/layout.py`.
Add `update_params()` to `DynParams` class

Add `update_params()` to `DynParams` class. This method receives a
dict as input argument and updates the parameter values mentioned in
the dict input.
Update corresponding unittest module to test the method.
Add `GeoParams` class and its unittest module

Add `GeoParams` class which is data structure to hold the geometric
parameters - frame, antecedant, sigma, mu, gamma, b, alpha, d, theta, r.
Add scaffolding code to `pysymoro/floatr.py`