[FEATURE] Create wheel and publish to Pypi

[Marco-Sulla]

The install instructions are really difficult. I think that:

1. A setup.py should be created
2. A wheel should be created
3. Release the last version with the wheel
4. publish it to Pypi

This way, installing EWA will be simply pip install ewa.

PS: obligatory requirement of mssql and cx_Oraclein code must be removed. The code that requires these libraries must be loaded only if the .ini file requires that database. There's no need to impose the user to install all the supported drivers.

PPS: instructions to how to install the absurdly compicated cx_Oracle driver should remain.