build: Replace manual AppImage bundling with appimage-builder script (#477)

* build: Tried to streamline and fix AppImage building

* build: Tried fixing build

* build: Added back version key

* build: Fixed AppImage name

* build: Fixed python bundling, fixed ELF uploading

* build: Don't upload a bunch of AppImage garbage files in the portable ELF version

* build: Fixed another wrong library path

* build: Removed old manual AppImage building scripts

dist/AppImage/Dockerfile

@@ -1,40 +0,0 @@
-FROM debian:bullseye-slim
-LABEL maintainer Example <example@example.com>
-
-ARG TAG=master
-ARG REPO=https://github.com/WerWolv/ImHex.git
-
-USER root
-
-# Bring packages up to date
-RUN apt-get update \
-    && apt-get upgrade -y \
-    && apt-get autoremove -y \
-    && apt-get install -y \
-        git \
-        cmake \
-        curl \
-        squashfs-tools
-
-# Fetch source and dependencies
-RUN mkdir -p /source \
-    && cd /source \
-    && git clone $REPO \
-    && cd ImHex \
-    && git checkout $TAG \
-    && git submodule update --init --recursive \
-    && cd /source/ImHex/dist \
-    && ./get_deps_debian.sh
-
-ARG CXX=g++-10
-
-# Build ImHex
-RUN mkdir -p /source/ImHex/build \
-    && cd /source/ImHex/build \
-    && cmake --install-prefix /usr -DCMAKE_BUILD_TYPE=Release .. \
-    && make -j
-
-# Prepare for AppImage
-RUN cd /source/ImHex/dist/AppImage \
-    && ./package.sh /source/ImHex/build \
-    && mv /source/ImHex/build/ImHex-x86_64.AppImage /