App refactoring

[NathanBnm]

Changelog

• Switch to meson build system
• Better translation integration (with meson)
• Add French translation
• Fix some warnings
• Add favourite heart icon in a column (this can be improved)
• Remove deprecated code

There is still things to do. But this this a first step. The app is building and working well.

This PR is ready for review

[georgesofianosgr]

Wow, these are a lot of changes for a single pull request.
Unfortunately I currently don't have access to elementary OS to test it and accept it.

Some notes/questions:

• I like the change to the meson build system.
• Can you explain the "Add translation capability" ? You could already translate the app.
• Why about modal should be removed ?
• Is SQLHeavy available in elementary PPA ? Because after elementary OS luna you had to install the deb package manual. I'm asking this because you removed it from the README

[NathanBnm]

@georgesofianosgr

Wow, these are a lot of changes for a single pull request.

I'm sorry I worked a lot on it and I didn't think to better separate the changes between them.

Unfortunately I currently don't have access to elementary OS to test it and accept it.

Can't you try it with a virtual machine? It's working well on my side.

Some notes/questions:

* I like the change to the meson build system.

It's quite the elementary standard now.

* Can you explain the "Add translation capability" ? You could already translate the app.

I didn't mean it that way, I meant with meson. I'll edit this.

* Why about modal should be removed ?

I contributed to a lot of elementary apps and it seems to be mentioned as deprecated by the elementary community. I think it's kind of because author credits are already mentioned in AppCenter.

* Is SQLHeavy available in elementary PPA ? Because after elementary OS luna you had to install the deb package manual. I'm asking this because you removed it from the README

Unfortunately not. And this is an issue I forgot to submit. But SQLHeavy is deprecated and cannot be installed via ppa. I have so much trouble to install it. Would it be possible to move to sqlite?

Just let me know if you have any questions 😄
I thought this project was kind of dead so I wasn't expecting an answer so fast!