[Therion] Mapiah v 0.2.18 release

[Rodrigo Severo]

Hi,

Mapiah version 0.2.17 was released yesterday at the end of the day but my internet connection is only now allowing me to announce it. Change log for this release:

- New features:

- Create shortcut to reverse line (R).
- When opening files, delete empty areas.
- When opening files, delete TH IDs from areas that do not refer to any existing line.
- When opening files, delete empty lines.
- Help page update.
- Snap to grid lines.
- Straight line segments line simplification.
- Fixed bugs:

- Removing XTherion inserted images throwing errors.
- Showing XVI parse errors at TH file open would throw because there was already a widget being built.
- Files with empty lines (with no line segments) or empty areas (no valid line TH ID) would throw an exception when calculating bounding box.
- Infrastructure maintenance:

- flutter pub upgrade --major-versions.
- Flutter upgrade to 3.35.4.

but it had a anoying bug where a failure to load XVI files dialog box was repeatly shown. Version 0.2.18 just fixes it, so get version 0.2.18, which will be available in a few minutes: desktop version available at [https://github.com/rsevero/mapiah/releases/tag/v0.2.1](https://github.com/rsevero/mapiah/releases/tag/v0.2.17)8 as expected and at https://mapiah.org/webapp/ as usual.

Please report.

Rodrigo
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