* Add support for Haiku OS

* Adjust DISTFILES and dist rule in haiku

This reverts commit d9da85a365.

This reverts commit 1ed5febe0c.

This reverts commit 89a158b9f4.

This reverts commit 278fcfdfc9.

This reverts commit 4d17b82950.

* Don't pack sources (github does it better), sign sources

* Make CircleCI generate the same git archive as Github, return make dist

* Revert make clean too

* Upload signature to Github release

* Read Github token from an env variable

- remove auto-stored session "@" on restore
- minor help update

This reverts commit cf388649b9.

This reverts commit 7f3d2c10aa.

- replace bools for internal non-persistent binary states with an uchar
- do not store path to session, derive from config path in tmp buffer
- program option to load session is not `-s`
- remove auto-stored session "@" on restore
- minor help update

- reduce 4 spaces between help columns as it's too wide for handhelds
- support `]` as prompt in nav-as-you-type-mode when filter is empty
- update plugin docs

Since 75061367be we only need to fill one %c