remove base-formats parser

[noviluni]

I've been playing around with the formats included in the base-formats parser (_try_hardcoded_formats method) and it seems that all of them are now fully supported by the absolute-time parser, so I think it doesn't have any sense to keep this parser, as it adds unnecessary complexity.

In fact, all the date formats with commas were not applied correctly: #720 and that means that only 3 of the past date formats were applied.

Examples:

'%B %d, %Y, %I:%M:%S %p'

>>> dateparser.parse('Diciembre 04, 1999, 11:04:59 PM', settings={'PARSERS': ['absolute-time']})                                                                                       
datetime.datetime(1999, 12, 4, 23, 4, 59)

>>>  dateparser.parse('December 22, 2009, 11:04:59 AM', settings={'PARSERS': ['absolute-time']})                                                                                        
datetime.datetime(2009, 12, 22, 11, 4, 59)

'%b %d, %Y at %I:%M %p'

>>> dateparser.parse('January 22, 2009 at 01:04 PM', settings={'PARSERS': ['absolute-time']})                                                                                          
datetime.datetime(2009, 1, 22, 13, 4)

'%d %B %Y %H:%M:%S'

>>> dateparser.parse('21 February 2009 1:04:05', settings={'PARSERS': ['absolute-time']})                                                                                              
datetime.datetime(2009, 2, 21, 1, 4, 5)

'%A, %B %d, %Y'

>>> dateparser.parse('Sunday, February 20, 2009', settings={'PARSERS': ['absolute-time']})                                                                                             
datetime.datetime(2009, 2, 20, 0, 0)

>>> dateparser.parse('Sunday, June 21, 2020', settings={'PARSERS': ['absolute-time']})                                                                                                 
datetime.datetime(2020, 6, 21, 0, 0)

>>> dateparser.parse('Saturday, June 21, 2020', settings={'PARSERS': ['absolute-time']})                                                                                               
datetime.datetime(2020, 6, 21, 0, 0)

'%Y-%m-%dT%H:%M:%S.%fZ'

>>>  dateparser.parse('1984-02-01T23:02:01.000001', settings={'PARSERS': ['absolute-time']})                                                                               
datetime.datetime(1984, 2, 1, 23, 2, 1, 1)

>>> dateparser.parse('1984-02-01T23:02:01.100001', settings={'PARSERS': ['absolute-time']})                                                                             
datetime.datetime(1984, 2, 1, 23, 2, 1, 100001)

[codecov]

Codecov Report

Merging #721 into master will increase coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #721      +/-   ##
==========================================
+ Coverage   95.23%   95.42%   +0.18%     
==========================================
  Files         302      304       +2     
  Lines        2560     2578      +18     
==========================================
+ Hits         2438     2460      +22     
+ Misses        122      118       -4     

Impacted Files	Coverage Δ
dateparser/date.py	98.77% <ø> (+0.76%)	⬆️
dateparser/calendars/__init__.py	95.06% <0.00%> (-0.45%)	⬇️
dateparser/languages/validation.py	93.43% <0.00%> (-0.44%)	⬇️
dateparser/search/detection.py	94.23% <0.00%> (-0.11%)	⬇️
dateparser/parser.py	98.91% <0.00%> (-0.02%)	⬇️
dateparser/search/search.py	99.35% <0.00%> (-0.01%)	⬇️
dateparser/calendars/jalali_parser.py	100.00% <0.00%> (ø)
dateparser/__init__.py	100.00% <0.00%> (ø)
dateparser/conf.py	100.00% <0.00%> (ø)
... and 1 more

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[Gallaecio]

Wow. Tests pass, so +1.