Combine some of the lexer tests into a single file

tests/lexer/thexlit.nim

@@ -1,12 +0,0 @@
-discard """
-  file: "thexlit.nim"
-  output: "equal"
-"""
-
-var t=0x950412DE
-
-if t==0x950412DE:
-    echo "equal"
-else:
-    echo "not equal"
-

tests/lexer/thexrange.nim

@@ -1,8 +0,0 @@
-
-type
-  TArray = array[0x0012..0x0013, int]
-
-var a: TArray
-
-echo a[0x0012] #OUT 0
-

tests/lexer/tlexermisc.nim

@@ -0,0 +1,27 @@
+discard """
+  action: run
+  output: "equal"
+"""
+
+var t=0x950412DE
+
+if t==0x950412DE:
+    echo "equal"
+else:
+    echo "not equal"
+
+type
+  TArray = array[0x0012..0x0013, int]
+
+var a: TArray
+
+doAssert a[0x0012] == 0
+
+
+# #7884
+
+type Obj = object
+    ö: int
+
+let o = Obj(ö: 1)
+doAssert o.ö == 1

tests/parser/tunicodeidents.nim

@@ -1,11 +0,0 @@
-discard """
-    action: run
-"""
-
-# #7884
-
-type Obj = object
-    ö: int
-
-let o = Obj(ö: 1)
-doAssert o.ö == 1