Text rework

[Martan03]

Features

• Add Line and StyledStr for better text parsing
• Add Text::append_lines to the Text trait
• Add text alignment and ellipsis into Paragraph
• Add Text trait implementation for Paragraph

Changes:

• Remove Text::render_offset (Text::append_lines should be used instead)
• Remove Text::get and Text::get_text
  • Text::get is replaced by std::fmt::Display implementation

Fixes

• Fix text parser ignoring whitespaces when Wrap::Word
• Fix text parser incorrectly measuring width