patterns/includes: More misc cleanups (#353)

* patterns/zip: simplify find_sequence_in_range check

hex(340282366920938463463374607431768211455) =
0xffffffffffffffffffffffffffffffff

* patterns/7z: use Magic<> for signature, add pragma

* patterns/{nro, ogg}: use Magic<> for signature

* patterns/ttf: refactor, check magic

Use the "Field field @ position;" syntax instead of saving and restoring
the cursor position.

* readme: fix copy-paste error in pattern listing

patterns/nro.hexpat

@@ -4,6 +4,7 @@
 
 import std.io;
 import std.sys;
+import type.magic;
 
 struct MOD0 {
 	char magic[4];
@@ -27,7 +28,7 @@ struct SegmentHeader {
 };
 
 struct Header {
-	char magic[4];
+	type::Magic<"NRO0"> magic;
 	u32 version;
 	u32 file_size;
 	u32 flags;
@@ -67,7 +68,6 @@ fn is_homebrew() {
 
 Start start @ 0x00;
 Header header @ $;
-std::assert(header.magic == "NRO0", "Invalid NRO File!");
 
 AssetHeader assets @ header.file_size;