Add more test cases (#1409)

test/asm/character-escape-at-end.asm

@@ -0,0 +1 @@
+println "hello\

test/asm/character-escape-at-end.err

@@ -0,0 +1,5 @@
+error: character-escape-at-end.asm(1):
+    Illegal character escape at end of input
+error: character-escape-at-end.asm(1):
+    Unterminated string
+error: Assembly aborted (2 errors)!

test/asm/character-escape-at-end.out

@@ -0,0 +1 @@
+hello\

test/asm/macro-args-outside-macro.asm

@@ -0,0 +1,3 @@
+	println \1
+	println \<2>
+	println \#

test/asm/macro-args-outside-macro.err

@@ -0,0 +1,7 @@
+error: macro-args-outside-macro.asm(1):
+    '\1' cannot be used outside of a macro
+error: macro-args-outside-macro.asm(2):
+    '\<2>' cannot be used outside of a macro
+error: macro-args-outside-macro.asm(3):
+    '\#' cannot be used outside of a macro
+error: Assembly aborted (3 errors)!

test/asm/macro-args-outside-macro.out

@@ -0,0 +1,3 @@
+
+
+

test/link/script-syntax-error.link

@@ -0,0 +1,7 @@
+rom0
+	"ROM0" org 1
+	"NONE" optional
+
+romx "1"
+romx 1
+	"ROM1"

test/link/script-syntax-error.out

@@ -0,0 +1,3 @@
+error: script-syntax-error.link(2): syntax error, unexpected ORG, expecting newline or OPTIONAL
+error: script-syntax-error.link(5): syntax error, unexpected string, expecting newline or number
+Linking failed with 2 errors