Add pokememes info, convert it to new format and drop unnecessary database tables

This commit introduces pokememes information storage in source code (because they're rarely changed and I always update them manually).

All information about pokememes updated after nerf of 25 April. Also, added buttons to /pokedeks command for changing pages (there are 21 pages already!), and limited one page to 35 pokememes.

lib/datamapping/levels.go

@@ -0,0 +1,12 @@
+// i2_bot – Instinct PokememBro Bot
+// Copyright (c) 2017 Vladimir "fat0troll" Hodakov
+
+package datamapping
+
+// Level is a struct, which represents level data
+type Level struct {
+	ID         int `yaml:"id"`
+	MaxExp     int `yaml:"max_exp"`
+	MaxEgg     int `yaml:"max_egg"`
+	LevelStart int `yaml:"level_start"`
+}

lib/datamapping/pokememes.go

@@ -0,0 +1,28 @@
+// i2_bot – Instinct PokememBro Bot
+// Copyright (c) 2017-2018 Vladimir "fat0troll" Hodakov
+
+package datamapping
+
+// Pokememe is a struct, which represents pokememes item data
+type Pokememe struct {
+	ID           int    `yaml:"id"`
+	Grade        int    `yaml:"grade"`
+	Name         string `yaml:"name"`
+	Description  string `yaml:"description"`
+	Attack       int    `yaml:"attack"`
+	HP           int    `yaml:"health"`
+	MP           int    `yaml:"mana"`
+	Defence      int    `db:"defence"`
+	Price        int    `yaml:"cost"`
+	Purchaseable bool   `yaml:"purchaseable"`
+	ImageURL     string `yaml:"image"`
+	Elements     []int  `yaml:"elements"`
+	Locations    []int  `yaml:"locations"`
+}
+
+// PokememeFull is a struct for handling pokememe with all informations about locations and elements
+type PokememeFull struct {
+	Pokememe  Pokememe
+	Locations []Location
+	Elements  []Element
+}