Add entry points

[chazuttu]

Summary

This PR converts scripts into entry points as per issue-#11.

• added entry points in setup.cfg
• added main() methods in scripts so that they can be called from command line just by name

Checklist

• Classes, Variables, function and methods logic ok
• Comments written explaining what the code does
• All python code is PEP8 compliant (run black .)
• No lint issues (run flake8)
• Test coverage with pytest implemented
• Reviewers assigned (at least 1 mentor)

Manual evidence

$ wsaa

para soporte de WebClient debe instalar httplib2
Encodign in cp1252
Usando CRT=reingart.crt KEY=reingart.key URL=https://wsaahomo.afip.gov.ar/ws/services/LoginCms SERVICE=wsfe TTL=36000
WSAA Version 3.11c  False
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<loginTicketResponse version="1.0">
    <header>
        <source>CN=wsaahomo, O=AFIP, C=AR, SERIALNUMBER=CUIT 33693450239</source>
        <destination>SERIALNUMBER=CUIT 20267565393, CN=reingart2019pub</destination>
        <uniqueId>657428365</uniqueId>
        <generationTime>2021-07-09T13:51:57.149-03:00</generationTime>
        <expirationTime>2021-07-10T01:51:57.149-03:00</expirationTime>
    </header>
    <credentials>
        <token>P+Cg==</token>
        <sign>s4M0=</sign>
    </credentials>
</loginTicketResponse>

$ wsfev1 --prueba

para soporte de WebClient debe instalar httplib2
Leyendo TA de C:\Users\pyafipws\py3test\lib\site-packages\pyafipws-3.9.b_2514_-py3.9.egg\pyafipws\cache\TA-2b4277f5962bd2cb0265c0fac4b32304.xml...
b"FECAESolicitar(Auth=*{'Token': <class 'str'>, 'Sign': <class 'str'>, 'Cuit': <alias 'long' for '<class 'int'>'>}*, FeCAEReq=*{'FeCabReq': 
*{'CantReg': <class 'int'>, 'PtoVta': <class 'int'>, 'CbteTipo': <class 'int'>}*, 'FeDetReq': [*{'FECAEDetRequest': *{'Concepto': <class 'int'>, 'DocTipo': <class 'sg': <class 'str'>}*}*], 'Errors': [*{'Err': *{'Code': <class 'int'>, 'Msg': <class 'str'>}*}*]}*}**:\n\nSolicitud de C\xf3digo de Autorizaci\xf3n Electr\xf3nico (CAE)\nHeaders: None"
Nro. Cbte. desde-hasta 493 493
Resultado A
Reproceso
CAE 71283954824423
Vencimiento 20210719
Observaciones 10217: El credito fiscal discriminado en el presente comprobante solo podra ser computado a efectos del Procedimiento permanente de transicion al Regimen General.
71283954824423 == 71283954824423
3 != 2
10217 != 10017
El credito fiscal discriminado en el presente comprobante solo podra ser computado a efectos del Procedimiento permanente de transicion al Regimen General.

$ pyfepdf --prueba --mostrar

para soporte de WebClient debe instalar httplib2
Encodign in cp1252
Prueba!

[reingart]

LGTM, there are some unneeded whitespace but we could address that in another PR