Fixes#10737.
Two parts to this: first, Keyman Core release build needs to generate
the .pdb file, and second, the build needs to put it and the .dll into
a place where the sentry-cli scan will find it.
This updates our meson min version on Windows to 1.0, which means that
we can avoid having Visual Studio on the path, as meson can find it
anyway. With this change, we can eliminate the batch-wrapper for the
build, significantly improving build performance and simplifying the
scripts.
This also adds a change to disable tests for dependency builds of core,
along with the `--no-tests` command line option for doing builds without
tests.
Minor cleanup includes eliminating various warnings from meson.build
files, and standardizing WASM cross-platform build options for Windows.
We no longer support Ubuntu 18.04 Bionic, so we can update to a newer meson
version. The oldest supported platform is now Ubuntu 20.04 Focal which
comes with Meson 0.53, so we make that the minimal required version.
