[Build]: Prepare for gamecoe integration

[nircoe]

• Upgrade CMake minimum version to 3.20 (match gamecoe)
• Upgrade C++ version to C++20 (match gamecoe)
• Organize CMake operation in .cmake files functions (fetch_openal_soft, fetch_logcoe)
• Upgrade testcoe to v0.1.1
• Upgrade logcoe to v0.1.1
• Make logcoe usage optional with SOUNDCOE_USE_LOGCOE
• Link logcoe private instead of public and only if SOUNDCOE_USE_LOGCOE
• Add generated header soundcoe_config.hpp for empty logcoe methods when !SOUNDCOE_USE_LOGCOE
• Wrap every include <logcoe.hpp> with if SOUNDCOE_USE_LOGCOE scope
• Modify ResourceManager::preloadDirectory() to return true if the directory is empty