adding backend agnostic IR

src/ape/ApeInstance.zig

@@ -14,7 +14,7 @@ pub const Interface = base.Instance;
 interface: Interface,
 backend_instances: std.ArrayList(*Interface),
 
-pub const EXTENSIONS = soft.Instance.EXTENSIONS;
+pub const extensions = soft.Instance.extensions;
 
 pub fn create(allocator: std.mem.Allocator, infos: *const vk.InstanceCreateInfo) VkError!*Interface {
     const self = allocator.create(Self) catch return VkError.OutOfHostMemory;

src/ape/lib.zig

@@ -10,9 +10,9 @@ pub const ApeInstance = @import("ApeInstance.zig");
 
 pub const Instance = ApeInstance;
 
-pub const DRIVER_NAME = "Ape";
+pub const driver_name = "Ape";
 
-pub const VULKAN_VERSION = vk.makeApiVersion(
+pub const vulkan_version = vk.makeApiVersion(
     0,
     config.ape_vulkan_version.major,
     config.ape_vulkan_version.minor,