ISSUE-1317: Fix model --force creation bugs

[BeMySlaveDarlin]

Hello!

• Type: bug fix
• Link to issue: Class constants vanish when model is regenerated with --force #1317

In raising this pull request, I confirm the following (please check boxes):

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR

Small description of change:
Fixed constants dropping in models when recreating with --force option: constants with access modifiers (public, protected, private) were ignored by preg_match pattern.
Fixed attributes duplication bug when recreating with --force option if no --camelize option declared and property is snake_cased.
Fixed column mapping on creation from table with PascalCase fields.

Thanks

[codecov]

Codecov Report

Merging #1498 (e249db0) into 4.0.x (e75d332) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##           4.0.x   #1498      +/-   ##
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+ Coverage   3.15%   3.16%   +0.01%     
========================================
  Files        111     111              
  Lines       5106    5079      -27     
========================================
  Hits         161     161              
+ Misses      4945    4918      -27