Display and std::error::Error for all errors; DHCP examples #815

	name: CI

	on:
	push:
	branches:
	- master
	pull_request:
	schedule:
	- cron: '50 4 * * *'
	workflow_dispatch:

	env:
	rust_toolchain: stable

	jobs:
	compile:
	name: Compile
	runs-on: ubuntu-latest
	steps:
	- name: Setup \| Checkout
	uses: actions/checkout@v2
	- name: Setup \| Rust
	uses: actions-rs/toolchain@v1
	with:
	toolchain: ${{ env.rust_toolchain }}
	components: rustfmt, clippy
	- name: Setup \| Std
	run: rustup component add rust-src --toolchain ${{ env.rust_toolchain }}-x86_64-unknown-linux-gnu
	- name: Setup \| Set default toolchain
	run: rustup default ${{ env.rust_toolchain }}
	- name: Build \| Fmt Check
	run: cargo fmt -- --check
	- name: Build \| Clippy
	run: cargo clippy --features embedded-svc --no-deps -- -Dwarnings
	- name: Build \| Default
	run: cargo build
	- name: Build \| Non-default
	run: cargo build --no-default-features

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