====== setFontSize ======

  * Parameters & Types:
     * playerid: number player ID
    * uiid: string the UIID of the custom UI
    * elementid: the UIID of the string element
     * size: number font size
  * Return value and type:
    * ErrorCode. OK
  * The main purpose of this method is to set the font size of the text symbol
  * Specific use cases are as follows:
<code>
--This function is executed when the player clicks on the block
local function clickblock(event)
    local playerid=event.eventobjid--Click on the player's mini number of the block
    local uiid="6986982063319417057"--Interface ID
    local elementid="6986982063319417057_1"--Text element id
    local size=50-- The font size of the text symbol to set
    --Sets the font size of the player's text symbols
    Customui:setFontSize(playerid, uiid, elementid, size)
end
ScriptSupportEvent:registerEvent([=[Player.ClickBlock]=], clickblock)
</code>