[WIP] Add toml like configuration

[csmoe]

Address #160

Config format: (from #160 (comment)):

[package.metadata.wasm-pack.build.<build_mode>]
debug = true
features = ["console_error_panic_hook"]
rustc-opt-level = 0
wasm-opt = false
wasm-snip = false
wasm-bindgen = true

build_mode = debug | profiling | production

[ashleygwilliams]

this is an awesome start @csmoe let me know if you need any help! i think the plan for landing this should be coordinated with the work in #163 and we'll need to get the other commands in there as well. i can start on that (or get others to start on that!) soon!

[mgattozzi]

@csmoe when you feel it's good for review just ping us :) I also just wanted to say I'm super stoked for this so thank you for working on it.

[fitzgen]

Is this actually still WIP? Or waiting on review?

[fitzgen]

I don't know whether the manifest module existed at the time this PR was written or not, but that seems to me like the "proper" location for this configuration parsing code.

[csmoe]

@fitzgen those changes were introduced into manifest locally indeed, but I don't know how to test for them since there is no build cmd, maybe I can take care of the splitting stuff, could you take a look at the no-response comment?#188 (comment)

[ashleygwilliams]

@csmoe if i am correct this is waiting on #216 ? if so, you can rebase onto that branch and then change the PR to be into that PR so we can be ready to merge when that lands (ideally today). thank you so much for all your hard work and especially for your patience!

[ashleygwilliams]

@csmoe if i am correct this is waiting on #216 ? if so, you can rebase onto that branch and then change the PR to be into that PR so we can be ready to merge when that lands (ideally today). thank you so much for all your hard work and especially for your patience!

additionally, i think we'll want some very basic docs and tests for this. lemme know if you want some direction on that.

[csmoe]

@ashleygwilliams yes, I'm waiting for build.
will restart tomorrow since it's midnight in my timezone.

[csmoe]

how does features work?
@ashleygwilliams impl From<Features> for CargoTomlFeaturesSection?

[csmoe]

@ashleygwilliams seems suppressed by #440, so close this?