Add Block settings to dotenv reader

Now blocks can be set as prefix names for variables via [Block Name] type
grouping.

test/phpUnitTests/dotenv/test.env

@@ -10,6 +10,8 @@ HAS_COMMENT_QUOTES_NO_SPACE="Comment at end with quotes no space"# Comment QES
 HAS_COMMENT_NO_QUOTES_SPACE=Comment at end no quotes and space # Comment NQE
 HAS_COMMENT_NO_QUOTES_NO_SPACE=Comment at end no quotes no space# Comment NQES
 COMMENT_IN_TEXT_QUOTES="Foo bar # comment in here"
+HAS_EQUAL_NO_QUITES=Is This = Valid
+HAS_EQUAL_QUITES="Is This = Valid"
 FAILURE = ABC
 SIMPLEBOX= A B  C
 TITLE=1
@@ -47,3 +49,10 @@ SUPERLINE=
 EMPTY=
 = flase
 asfasdf
+# BLOCK TESTS
+[Var Test]
+TEST="Block 1 D"
+[OtherSet]
+TEST="Block 2 D"
+[Ignore-Invalid-Block]
+TEST="Block 3 D"