Add mathjs singleton and expose it via API

[Cube707]

This allows for modification of mathjs by the user, mostly to allow for the use of math.import to define custom functions.

See the new Advanced Examples/Customising mathjs for details.

closes #480

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This is a first implementation, it works but I am sure there are better ways to implement the singleton.
Finding the right place in the lifecycle of the app just went over my head

I am also unsure if the MathjsInstance should be per-app or per file?

[mProjectsCode]

I am also unsure if the MathjsInstance should be per-app or per file?

This brings up an important point. The additions to mathjs only work once the code adding them has run. Code block execution order in a file is usually top to bottom, but that is not guaranteed. They can theoretically run in any order, so math view fields could run before the js-engine code block adding the needed mathjs extensions.

One approach could be to enable users to somehow register global mathjs extensions on plugin load.

[Cube707]

They can theoretically run in any order, so math view fields could run before the js-engine code block adding the needed mathjs extensions.

that would be super annoying if it happens randomly sometimes.

One approach could be to enable users to somehow register global mathjs extensions on plugin load

I also thought about adding a config option where the user could input a object to initialize the context with. This was just the quickest way to get a working version to test if it works at all.
I am also not sure how the object would be input as a config, JSON should work but I find it much easier to add stuff via a js-engine block than having to externally convert a JS function to JSON and copy-paste it in.

[mProjectsCode]

yeah, maybe a path to a JS file that get's run via js-engine at statup

[Cube707]

maybe a path to a JS file that get's run via js-engine at statup

I like the Idea, maybe identically to how Base Obsidian handles css snippets, just as JS snippets.

But it starts to feel more like it should be a Feature of JS-engine now?

[mProjectsCode]

But it starts to feel more like it should be a Feature of JS-engine now?

Yeah. Maybe it's better to just add a simple API to MB and the startup script thing to js-engine

[mProjectsCode]

After a few days of thought, I want to go with a simple API on the MB side and adding startup scripts to js-engine.

[mProjectsCode]

I just released statup scripts in js-engine 0.2.0

[mProjectsCode]

Looks good so far, but I think tutorial should be moved to the docs.

[Cube707]

documentation moved to mProjectsCode/obsidian-meta-bind-plugin-docs#12

[mProjectsCode]

Thanks :)