Fix compatibility with some environments

• Cast count to int to improve compatibility with all database servers
• Add missing Flarum 1.2+ requirement from last version

Smaller bundle size with Webpack 5

Behind the scenes, typescript and Webpack 5 are now used.

This update requires Flarum 1.2+

Flarum 1.0 compatibility

Adds compatibility with Flarum 1.0+

Flarum beta 16 compatibility

• Add compatibility with Flarum beta 16