NOISSUE basic code for downloading JREs from Mojang

Not integrated yet, but the logic has tests and shouldn't
be too shaky. Integration comes next.

api/logic/CMakeLists.txt

@@ -306,6 +306,9 @@ set(MINECRAFT_SOURCES
     # Skin upload utilities
     minecraft/SkinUpload.cpp
     minecraft/SkinUpload.h
+
+    mojang/PackageManifest.h
+    mojang/PackageManifest.cpp
     )
 
 add_unit_test(GradleSpecifier
@@ -313,6 +316,22 @@ add_unit_test(GradleSpecifier
     LIBS MultiMC_logic
     )
 
+add_executable(PackageManifest
+    mojang/PackageManifest_test.cpp
+)
+target_link_libraries(PackageManifest
+    MultiMC_logic
+    Qt5::Test
+)
+target_include_directories(PackageManifest
+    PRIVATE ../../cmake/UnitTest/
+)
+add_test(
+    NAME PackageManifest
+    COMMAND PackageManifest
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
 add_unit_test(MojangVersionFormat
     SOURCES minecraft/MojangVersionFormat_test.cpp
     LIBS MultiMC_logic