Remove blockclass::clear(), simplify blockclass initializations

Previously, it was used in order to clear a block and deactivate it, and
the constructor function simply called clear() in order to not duplicate
code. However, clear() is no longer necessary (just remove the block
from the blocks vector), and so we can put initialization right back in
the constructor function.

desktop_version/src/BlockV.cpp

@@ -1,11 +1,6 @@
 #include "BlockV.h"
 
 blockclass::blockclass()
-{
-	clear();
-}
-
-void blockclass::clear()
 {
 	type = 0;
 	trigger = 0;

desktop_version/src/BlockV.h

@@ -9,8 +9,6 @@ class blockclass
 public:
     blockclass();
 
-    void clear();
-
     void rectset(const int xi, const int yi, const int wi, const int hi);
 
     void setblockcolour(std::string col);