Refactor and add generated API bindings

.github/workflows/CI.yml

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+name: CI
+on:
+  push:
+    branches:
+      - main
+    tags: ['*']
+  pull_request:
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - '1'
+          - '1.6'
+          - '1.8'
+          - 'nightly'
+        os:
+          - ubuntu-latest
+          - osx
+          - windows
+        arch:
+          - x64
+          - aarch64
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: julia-actions/cache@v1
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+  docs:
+    name: Documentation
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: '1'
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-docdeploy@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - run: |
+          julia --project=docs -e '
+            using Documenter: DocMeta, doctest
+            using Fontconfig
+            DocMeta.setdocmeta!(Fontconfig, :DocTestSetup, :(using Fontconfig); recursive=true)
+            doctest(Fontconfig)'

gen/Project.toml

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+[deps]
+Clang = "40e3b903-d033-50b4-a0cc-940c62c95e31"
+Clang_jll = "0ee61d77-7f21-5576-8119-9fcc46b10100"
+Cxx = "a0b5b9ef-44b7-5148-a2d1-f6db19f3c3d2"
+EzXML = "8f5d6c58-4d21-5cfd-889c-e3ad7ee6a615"
+Fontconfig_jll = "a3f928ae-7b40-5064-980b-68af3947d34b"
+JuliaFormatter = "98e50ef6-434e-11e9-1051-2b60c6c9e899"
+MacroTools = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"