Fix TextEmbed widget placeholders
#2
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- Fix: Use U+F8FE and U+F8FF (last two codepoints of first PUA) with widths of 1 cell instead of U+0000 and U+0001 with widths of 0 cells. - Add: `._UW_PLACEHOLDER_HEAD` and `._UW_PLACEHOLDER_TAIL`. - Change: Remove codepoints used for widget placeholders from `.get_text()`'s docstring. Fixes incompatibility with urwid>=2.5.3. Refs: #1
- Add: Implement widget placeholder codepoints override. - Add: `.__init_subclass__()`. - Change: Rename: - `._UW_PLACEHOLDER_HEAD` -> `.PLACEHOLDER_HEAD` - `._UW_PLACEHOLDER_TAIL` -> `.PLACEHOLDER_TAIL` - `._uw_placeholder_pattern` -> `._UW_PLACEHOLDER_PATTERN` - `._uw_tail_pattern` -> `._UW_PLACEHOLDER_PATTERN`
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TextEmbed.PLACEHOLDER_HEADandTextEmbed.PLACEHOLDER_TAIL.Fixes #1