Prevent memory leaks on reinstantiation, open up cookies, fix compilation of php >=7.4 (#639)

WordPress/playground-tools#110 depends on this
PR:

**Allow PHP instances to stop & restart without leaking memory.**

* Expose PHP's exit() function to javascript to allow instances to be
shutdown and garbage collected.
* Tweaks load-php-runtime.ts to delete local references to instances
upon shutdown.

**Allow calling code to access cookies inside PHPBrowser**

* `PHPBrowser`'s `setCookies` & `serializeCookies` are no longer private
methods, allowing multiple instances to share the same login.

**Allow PHP >= 7.4 to compile without failure.**

* ~~Patches were updated for PHP >=7.4 to account for deprecated macros:
php/php-src#11678
* All versions of PHP >= 8.0 have been updated to the latest minor
versions, necessitating some tweaks to the existing patch lines.

**EMSDK Version Locked**

* Emsdk is now locked to use version `3.1.43` rather than `latest`. This
makes the dockerfile deterministic, as minor version updates to
emscripten are not always 100% 1:1 compatible.
* Recommend not updating that value without running tests first. A
dockerfile is a lot like a lockfile. Versions should be committed.

**Dockerfile Re-ordering**

* Moved steps that use PHP_VERSION as far down as possible. All previous
steps are identical, so a build of all PHP versions can re-use all these
layers from cache. Conversely, if a previous layer uses PHP_VERSION,
they will not be considered the same and the cache will not apply.
Ordering the build in this way should speed things up a bit as now it
can skip to step 54 after running those for the first build.
* OpenSSL no longer copies `man` page documentation as part of the build
process, as this is relatively pointless inside a build container.

**Sourcemaps & Debugging**

* The directory structure where the final WASM files live has been
shuffled a bit to account for sourcemaps. Sourcemaps may be now be built
with `npm run recompile:php:node -- --WITH_SOURCEMAPS=yes`. PHP sources
will be copied to each version directory, and sourcemaps can be loaded
into chrome devtools via a right click on WASM disassembled code > add
source map > `file://[ABSOLUTE LOCAL PATH TO .wasm.map FILE]`

---------

Co-authored-by: Adam Zieliński <[email protected]>

Author: seanmorris

.editorconfig

@@ -11,3 +11,6 @@ indent_size = 4
 [*.md]
 max_line_length = off
 trim_trailing_whitespace = false
+
+[*.patch]
+trim_trailing_whitespace = false

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
         steps:
             - uses: actions/checkout@v3
             - uses: ./.github/actions/prepare-playground
-            - run: npx nx affected --target=test --configuration=ci
+            - run: node --expose-gc node_modules/nx/bin/nx affected --target=test --configuration=ci
     build:
         runs-on: ubuntu-latest
         needs: [lint-and-typecheck]

package.json

@@ -43,7 +43,7 @@
 		"recompile:php:node:8.1": "nx recompile-php php-wasm-node --PHP_VERSION=8.1",
 		"recompile:php:node:8.2": "nx recompile-php php-wasm-node --PHP_VERSION=8.2",
 		"release": "lerna publish patch --yes --no-private --loglevel=verbose",
-		"test": "nx run-many --all --target=test",
+		"test": "node --expose-gc node_modules/nx/bin/nx run-many --all --target=test",
 		"fix-asyncify": "node packages/php-wasm/node/bin/rebuild-while-asyncify-functions-missing.mjs",
 		"typecheck": "nx run-many --all --target=typecheck",
 		"prepare": "husky install"