Log Message:
editors/tp-note: update to 1.21.5

Rename root dir marker `.tpnoteroot`; Add pseudo lang. tag `+all`

* Breaking change: rename root directory marker file from `.tpnoteroot` to
  `.tpnoteroot.toml`.
* Allow optional project specific configuration data in `.tpnoteroot.toml`.
  Tp-Note will source the configuration for all note file in all subdirectories.
  Empty `.tpnoteroot.toml` content is still allowed.
* Interpret the pseudo language tag `+all` as "select all available \ 
languages"
  in the environment variable `TPNOTE_LANG_DETECTION` and the configuration
  file variable `tmpl.filter_get_lang`.