git: Moved build instructions from the readme to individual files

dist/compiling/linux.md

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+### Compiling ImHex on Linux
+
+Dependency installation scripts are available for many common Linux distributions in the [/dist](dist) folder.
+After all the dependencies are installed, run the following commands to build ImHex:
+
+```sh
+mkdir -p build
+cd build
+CC=gcc-12 CXX=g++-12 cmake                    \
+    -DCMAKE_BUILD_TYPE=Release                \
+    -DCMAKE_INSTALL_PREFIX="/usr" 	          \
+    -DCMAKE_C_COMPILER_LAUNCHER=ccache        \
+    -DCMAKE_CXX_COMPILER_LAUNCHER=ccache      \
+    -DCMAKE_C_FLAGS="-fuse-ld=lld"            \
+    -DCMAKE_CXX_FLAGS="-fuse-ld=lld"          \
+    -DCMAKE_OBJC_COMPILER_LAUNCHER=ccache     \
+    -DCMAKE_OBJCXX_COMPILER_LAUNCHER=ccache   \
+    -DRUST_PATH="$HOME/.cargo/bin/"           \
+    ..
+make -j 4 install
+```
+
+---
+
+Put the ImHex executable into the `/usr/bin` folder.
+Put libimhex.so into the `/usr/lib` folder.
+Configuration files go to `/usr/etc/imhex` or `~/.config/imhex`.
+All other files belong in `/usr/share/imhex` or `~/.local/share/imhex`:
+
+```
+Patterns: /usr/share/imhex/patterns
+Pattern Includes: /usr/share/imhex/includes
+Magic files: /usr/share/imhex/magic
+Python: /usr/share/imhex/lib/pythonX.X
+Plugins: /usr/share/imhex/plugins
+Configuration: /etc/xdg/imhex/config
+```
+
+All paths follow the XDG Base Directories standard, and can thus be modified
+with the environment variables `XDG_CONFIG_HOME`, `XDG_CONFIG_DIRS`,
+`XDG_DATA_HOME` and `XDG_DATA_DIRS`.

dist/compiling/macOS.md

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+### Compiling ImHex on macOS
+
+To build ImHex on macOS, run the following commands:
+
+```sh
+brew bundle --no-lock --file dist/Brewfile
+mkdir -p build
+cd build
+CC=$(brew --prefix gcc@12)/bin/gcc-12     \
+CXX=$(brew --prefix gcc@12)/bin/g++-12    \
+OBJC=$(brew --prefix llvm)/bin/clang      \
+OBJCXX=$(brew --prefix llvm)/bin/clang++  \
+PKG_CONFIG_PATH="$(brew --prefix openssl)/lib/pkgconfig":"$(brew --prefix)/lib/pkgconfig" \
+MACOSX_DEPLOYMENT_TARGET="10.15"          \
+cmake                                     \
+  -DCMAKE_BUILD_TYPE=$BUILD_TYPE          \
+  -DCREATE_BUNDLE=ON                      \
+  -DCREATE_PACKAGE=ON                     \
+  -DCMAKE_C_COMPILER_LAUNCHER=ccache      \
+  -DCMAKE_CXX_COMPILER_LAUNCHER=ccache    \
+  -DCMAKE_OBJC_COMPILER_LAUNCHER=ccache   \
+  -DCMAKE_OBJCXX_COMPILER_LAUNCHER=ccache \
+  ..
+make -j4 package
+```
+
+Open the generated .dmg file and drag-n-drop the ImHex executable to the Applications folder
+
+All other files belong in `~/Library/Application Support/imhex`:
+```
+Patterns: ~/Library/Application Support/imhex/patterns
+Pattern Includes: ~/Library/Application Support/imhex/includes
+Magic files: ~/Library/Application Support/imhex/magic
+Python: ~/Library/Application Support/imhex/lib/pythonX.X
+Plugins: ~/Library/Application Support/imhex/plugins
+Configuration: ~/Library/Application Support/imhex/config
+```
+
+If the build fails while trying to find the macOS libraries, make sure you have
+XCode installed with `xcode-select --install`. Homebrew will also help get the
+most recent SDK installed and configured with `brew doctor`.

dist/compiling/windows.md

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+### Compiling ImHex on Windows
+
+On Windows, ImHex is built through msys2 / mingw. To install all dependencies, open a mys2 window and run the PKGCONFIG script in the [dist/msys2](dist/msys2) folder.
+After all the dependencies are installed, run the following commands to build ImHex:
+
+```sh
+mkdir build
+cd build
+cmake -G "MinGW Makefiles"                \
+  -DCMAKE_BUILD_TYPE=Release              \
+  -DCMAKE_INSTALL_PREFIX="$PWD/install"   \
+  -DCMAKE_C_COMPILER_LAUNCHER=ccache      \
+  -DCMAKE_CXX_COMPILER_LAUNCHER=ccache    \
+  -DCMAKE_C_FLAGS="-fuse-ld=lld"          \
+  -DCMAKE_CXX_FLAGS="-fuse-ld=lld"        \
+  -DCMAKE_OBJC_COMPILER_LAUNCHER=ccache   \
+  -DCMAKE_OBJCXX_COMPILER_LAUNCHER=ccache \
+  -DRUST_PATH="$USERPROFILE/.cargo/bin/"  \
+  ..
+mingw32-make -j install
+```
+
+ImHex will look for any extra resources either in various folders directly next to the executable or in `%localappdata%/imhex`