Shellui

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fixed:
* build:
* include README.MD, LICENSE and requirements.txt in build

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added:
* build:
* requirements and setup configuration file in root directory
* metadata in form of headers in shellui module
* docs:
* automatically created docstring documentation via sphinx in docs/ directory
changed:
* build:
* list of ignored files for git in .gitignore
* docs:
* update item INSTALLATION in README.MD file

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added:
* widgets:
* CheckBox class in ui.board module
* layouts:
* ui.board module:
* HLayout class represents horizontal layout
* Layout class represents abstract class of layout for layouts:
* set_text method calculates size of text attribute
* render method replaces element render methods with custom style method
* set_cursor_skin method defines cursor skin
* ui.abstracts.AbstractLayout.search_element_by_tag method searches elements in this Layout by tag
* logging:
* \_\_init__ module:
* add EVENT, KEYBOARD and CREATE logging level
* create_level method is used to create logging levels
* logging_level argument defines logging level in debug_start function
* save_critical_error argument in debug_start function defines whether errors will be intercepted and saved to file
* close method calls function endwin of curses in core.terminal.Terminal class
* add tag attribute to ui.abstracts.BaseElement class
changed:
* widgets:
* text argument from Label and Button classes moved to Widget class
* layouts:
* ui.abstracts.AbstractLayout.add_elements method:
* calculates size of layout by elements
* accepts unlimited elements number
* ui.board module:
* common methods of VLayout class moving to Layout class
* inheritance of select and deselect method in VLayout class
* render:
* board.VLayout class:
* deselect widgets works correctly in update method
* draw method has become more readable in core.terminal.Terminal class
* typing:
* typings.Collection class can pass list to parameters
removed:
* overridden add_elements method in ui.board.VLayout class

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added:
* core.handler module:
* keyboardEvent class
* KeyboardManager class
* FlagsManager class
* ui.board.Widget class
* core.typings.Position dataclass
* interface_level argument in core.typings.Collection class
changed:
* core.terminal.Terminal:
* optimize draw method
* rename argument console to terminal
* methods in BaseElement class
* methods in core.typings.Collection class
* rename HLayout to VLayout class
removed:
* core.typings.Buffer class:
* __post_init__ method
* kwargs argument
* ActiveWidget and StaticWidget class in ui.board module

==================

added:
* docstrings to classes, methods and arguments

==================

changed:
* core.handler.EventUnit class:
* now \_\_call__ method shortens passed args and kwargs for debug message
* now \_\_init__ method saves passed parent class in EventUnit.parent attribute
* core.typings.Collection.run_elements_method method:
* rename run_elements_method to call_elements_event
* now calls events on Collection elements
* ui.board.HLayout.render method:
* now changes element position in HLayout based on position same element
* rename method output to render in ui.abstracts.BaseElement class
* improve code readability