Pyqode-cobol

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As of pyqode 2.11, the project has entered in maintainance mode. Only critical bug fixes will be adressed. The core
team won't add any new features but we will continue to accept PR as long as they are properly tested and not too risky.

New features:

- update COBOL keywords for GnuCOBOL 2.x
- current word highlighter is now case insensitive
- add support for PyQt 5.7

Bug fixes:

- improved indentation (TAB/SHIFT+TAB) in fixed mode
- improvements to the name parser in complex structures
- remove highlighting of lines that starts with '*' in free format (See pyQode/pyQode64)
- fix pyQode/pyQode63
- fix pyQode/pyQode70

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Fixed bugs:

- fix name parser issue with complex pic field structure to prevent ordering by level.

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Fixed bugs:

- correct recognition of SECTION/DIVISION in oder to prevent EXIT SECTION to be shown in the document outline

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New features:

- add a public method to refresh pic field info
- improve name parser: assume missing headers
- many improvements to the cobol code folding (tested on cobolmac and cobjapi).

Fixed bugs:

- wait for fixed/free format to be set on the backend before performing outline analysis
- fix comments mode in fixed format not inserting the comment symbol at column 7 but two columns before the first
non whitepsace character.

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New features:

- add a multi-margins mode: user can configure up to 4 margins

Fixed bugs:

- fix wrong offset for level 77 items

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New features:
- add the new cursor history mode to the cobol editor
- add the new read only panel to the cobol editor
- add color_scheme argument to code editor constructor

Fixed bugs:
- fix many potential memory leaks by breaking the circular dependencies
correctly before removing a mode/panel