Structure refactoring

1. Edited structure of project: planted services for each group of actions on the forms
2. Fixed great number of bugs in previous realization of actions & completed already existing functions to the logical end
3. Selecting problems solved
4. Added combining of font styles, reversing styles
5. Refactored the opening and saving (the part w/ coloring text from black to white) to more rational way

MVP

MVP. Features:

1. Load .rtf
2. Save, save as .rtf
3. Create new empty worksheet
4. Change font, size, color, style of text
5. Change opacity of form
6. Change left, right, first-line indents
7. Change left, right, center alignment
8. Hide, close and spread the main window