Remove traits TextApi, TextApiExt, EditableTextApi

These are not the ideal type-erased API in KAS,
and likely also not elsewhere.

src/display/glyph_pos.rs

@@ -255,7 +255,7 @@ impl TextDisplay {
     ///
     /// This may be used as follows:
     /// ```no_run
-    /// # use kas_text::{Glyph, Text, TextApi, TextApiExt, Vec2};
+    /// # use kas_text::{Glyph, Text, Vec2};
     /// # fn draw(_: Vec<(f32, Glyph)>) {}
     /// let mut text = Text::new("Some example text");
     /// text.prepare();

src/format.rs

@@ -42,7 +42,7 @@ pub trait FormattableText: std::cmp::PartialEq + std::fmt::Debug {
     /// It is expected that [`FontToken::start`] of yielded items is strictly
     /// increasing; if not, formatting may not be applied correctly.
     ///
-    /// The default [font size][crate::TextApi::set_font_size] (`dpem`) is passed
+    /// The default [font size][crate::Text::set_font_size] (`dpem`) is passed
     /// as a reference.
     ///
     /// For plain text this iterator will be empty.
@@ -82,7 +82,7 @@ pub trait FormattableTextDyn: std::fmt::Debug {
     /// It is expected that [`FontToken::start`] of yielded items is strictly
     /// increasing; if not, formatting may not be applied correctly.
     ///
-    /// The default [font size][crate::TextApi::set_font_size] (`dpem`) is passed
+    /// The default [font size][crate::Text::set_font_size] (`dpem`) is passed
     /// as a reference.
     ///
     /// For plain text this iterator will be empty.