This PR drops the use of brew for dependency management in favor of
macports so we can support lower macOS versions instead of just the
lowest one supported by Apple
Closes#2586
### Problem description
#### Problem 1
In borderless mode ImHex disables the standard macOS titlebar rendering
and input processing. As a result double clicking the titlebar does not
trigger the native macOS behavior set in `System Settings -> Desktop &
Dock -> Double-click a window's title bar to [Zoom/Minimize/Do
nothing]`.
#### Problem 2
The ImHex window shows up as blank/transparent when de-minimizing it
from the dock.
#### Problem 3
Widgets experience ghost hover inputs from the past position of the
cursor during live resizing.
### Implementation description
ImGui elements consume input events in the order they are drawn. As a
result by "drawing" an `InvisibleButton` over the content area of the
titlebar we can catch unprocessed clicks in the titlebar area.
Connecting this button's double clicks to the native window is then a
trivial endeavour.
The blank windows was caused by the rendering stack clearing the GL
buffer, but proceeding to draw nothing in it. I have short circuited
this path.
Ghost hover inputs were squelched by consistently moving the ImGui
cursor to `0, 0` during a live resize. The OS will dispatch a cursor
positioning event once the resizing ends, restoring normal behavior.
### Screenshots
N/A
### Additional things
N/A
---------
Co-authored-by: Nik <werwolv98@gmail.com>
* build: Experimentally switch to gcc on macOS
* build: Corrected gcc paths
* build: Enable objective c support on macOS
* build: Enable ObjC and ObjC++ on macOS
* build: Add ObjC and ObjC++ flags
* build: Try compiling objc with clang
* build: Remove invalid flags again
* fix: Let's not include objc headers in C++ code
* sys: Move macos utils code to its own file
* fix: Missing unistd include on mac
* sys: Removed loader script stuff since it's currently unused and broken
* fix: Missing include
* fix: Another missing include
* fix: CFURLCreateWithBytes wants a pointer to mutable data
* fix: Try disabling name mangling of ObjC functions
* sys: Move macos utils declarations to its own header file
* fix: C Linkage
* fix: Move objc function prototypes to C++ headers
* fix: More missing includes
* fix: Warning error
* sys: Call ObjC with C ABI instead of trying to use C++
* build: Update libraries
* sys: Fixed build errors
* sys: No const correctness I guess
* sys: Fixed prototypes
* sys: This is C now
* sys: More nullptr -> NULL
* sys: Fix crash on exit
* sys: Try using proper std concepts instead of custom ones
* sys: Replaced another hex::is_signed
* build: Upgrade to gcc 12 and MacOS Monterey
* build: Fixed MacOS runner name
* build: Cache correct ccache folder on macOS
