split config_entries data into data and options parts

[NecroKote]

This allows changing all parameters other than integration type and
it's id at any point

This change also contains a bump to SCHEMA_VERSION up to 4 and a migration steps for existing configurations of version 3

I've only checked this with "SL Departure" integration, so additional testing is much appreciated :)

Fixes #51

[pep8speaks]

Hello @NecroKote! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file custom_components/hasl3/__init__.py:

Line 273:80: E501 line too long (88 > 79 characters)

• In the file custom_components/hasl3/binary_sensor.py:

Line 44:12: E713 test for membership should be 'not in'
Line 46:80: E501 line too long (90 > 79 characters)
Line 48:80: E501 line too long (80 > 79 characters)
Line 100:80: E501 line too long (84 > 79 characters)
Line 102:80: E501 line too long (227 > 79 characters)
Line 111:80: E501 line too long (84 > 79 characters)

• In the file custom_components/hasl3/config_flow.py:

Line 151:80: E501 line too long (81 > 79 characters)
Line 152:80: E501 line too long (85 > 79 characters)
Line 154:80: E501 line too long (88 > 79 characters)
Line 156:80: E501 line too long (96 > 79 characters)
Line 202:80: E501 line too long (84 > 79 characters)

• In the file custom_components/hasl3/sensor.py:

Line 81:80: E501 line too long (81 > 79 characters)
Line 82:80: E501 line too long (99 > 79 characters)
Line 83:80: E501 line too long (95 > 79 characters)
Line 94:80: E501 line too long (109 > 79 characters)
Line 95:80: E501 line too long (91 > 79 characters)
Line 97:80: E501 line too long (109 > 79 characters)
Line 98:80: E501 line too long (91 > 79 characters)
Line 110:80: E501 line too long (132 > 79 characters)
Line 111:80: E501 line too long (130 > 79 characters)
Line 126:80: E501 line too long (87 > 79 characters)
Line 174:80: E501 line too long (80 > 79 characters)
Line 175:80: E501 line too long (98 > 79 characters)
Line 176:80: E501 line too long (97 > 79 characters)
Line 186:80: E501 line too long (80 > 79 characters)
Line 187:80: E501 line too long (98 > 79 characters)
Line 188:80: E501 line too long (95 > 79 characters)
Line 199:80: E501 line too long (133 > 79 characters)
Line 200:80: E501 line too long (134 > 79 characters)
Line 248:80: E501 line too long (203 > 79 characters)
Line 373:80: E501 line too long (203 > 79 characters)
Line 502:80: E501 line too long (97 > 79 characters)
Line 519:80: E501 line too long (205 > 79 characters)
Line 717:80: E501 line too long (97 > 79 characters)
Line 734:80: E501 line too long (205 > 79 characters)
Line 917:80: E501 line too long (97 > 79 characters)
Line 934:80: E501 line too long (205 > 79 characters)
Line 1120:80: E501 line too long (238 > 79 characters)
Line 1224:80: E501 line too long (209 > 79 characters)
Line 1325:80: E501 line too long (84 > 79 characters)
Line 1327:80: E501 line too long (227 > 79 characters)
Line 1336:80: E501 line too long (84 > 79 characters)